List questions from proof-verification

Published on 07 Feb 2018 - 3:50

761

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Proof of $c<a+b$ for a right triangle

Published on 07 Feb 2018 - 5:40

56

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$A^n = I$ only if $n\equiv 0 \pmod{4}$

Published on 23 Mar 2026 - 9:33

45

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Proof of $\forall x\in \mathbb{R}^+, \exists q\in \mathbb{R}^+, q<x$.

Published on 07 Feb 2018 - 16:09

22

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Is $g:\mathbb{P}_1 \rightarrow \mathbb{P}_2 ,g(p)(x)=\int_0^x p(t)dt$ injective?

Published on 07 Feb 2018 - 16:49

90

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A group $G$ is abelian if and only if a certain subset of the direct product is a subgroup

Published on 07 Feb 2018 - 17:23

704

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Recovering classical solution from weak one for the Laplace equation

Published on 23 Mar 2026 - 11:55

250

Views

Let $(X,d_{disc})$. Show that $E\subset X$ is disconnected

Published on 07 Feb 2018 - 19:59

60

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Do all series whose terms are differences between a sequence and its limit diverge?

Published on 20 Mar 2026 - 4:14

1.8k

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how to prove that a natural number n > 1 is prime if and only if n divides (n-2)! - 1?

Published on 07 Feb 2018 - 20:50

68

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Is this function injective? + Proof

Published on 07 Feb 2018 - 21:25

36

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Condition on $\nu$ which makes the inclusion map from $C(X)$ to $L^{\infty}(X)$ injective

Published on 24 Mar 2026 - 22:09

53

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Mistake in the wording of a question about the cardinality of a set of primes?

Published on 20 Mar 2026 - 9:03

69

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Proving a floor function

Published on 16 Mar 2026 - 16:12

38

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Does this method of proof work?

Published on 25 Mar 2026 - 15:10

List Question

Show that completely regular is a topological property

Proof of $c<a+b$ for a right triangle

$A^n = I$ only if $n\equiv 0 \pmod{4}$

Proof of $\forall x\in \mathbb{R}^+, \exists q\in \mathbb{R}^+, q<x$.

Is $g:\mathbb{P}_1 \rightarrow \mathbb{P}_2 ,g(p)(x)=\int_0^x p(t)dt$ injective?

A group $G$ is abelian if and only if a certain subset of the direct product is a subgroup

Recovering classical solution from weak one for the Laplace equation

Let $(X,d_{disc})$. Show that $E\subset X$ is disconnected

Do all series whose terms are differences between a sequence and its limit diverge?

how to prove that a natural number n > 1 is prime if and only if n divides (n-2)! - 1?

Is this function injective? + Proof

Condition on $\nu$ which makes the inclusion map from $C(X)$ to $L^{\infty}(X)$ injective

Mistake in the wording of a question about the cardinality of a set of primes?

Proving a floor function

Does this method of proof work?

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